Kate Beckinsale hospitalized for ruptured ovarian cyst

Kate Beckinsale, seen here at the Producers Guild Awards on Jan. 19, may not make it to Sunday's Screen Actors Guild Awards after suffering a ruptured ovarian cyst this weekend.(Photo: Axelle/Bauer-Griffin, FilmMagic)

Kate Beckinsale has a good excuse to miss Sunday's Screen Actors Guild Awards: The "Underworld" actress revealed via Instagram early Sunday that she had been hospitalized.

Ovarian cysts are fluid-filled sacs that form on or inside the ovaries, according to the Mayo Clinic's website. The most common forms develop when an egg is not released as expected during menstruation and go away on their own within a few months. However, they, and other types of ovarian cysts, can occasionally rupture or break open.

Symptoms of a ruptured ovarian cyst include dizziness, nausea, vomiting and most notably, intense pelvic or abdominal pain, usually on the side of the body where the ovary with the ruptured cyst is located. Bleeding at the time of rupture can elevate the situation to a medical emergency and may indicate surgery is required.

USA TODAY has reached out to Beckinsale's representatives for an update on her condition.